@Maniac: The federation is TINY compared to the empire/republic. Coruscant alone has a population of a single trillion, and with thousands of planets under it's aegis which likely have populations in the billions
Okay here we run into the problem that Star Wars clearly does not have any consistent cannon so you can basically make an argument for any number you want.
Consider Naboo and Tatooine, two of the planets were actually see in any sort of detail. They clearly do not have billions of inhabitants. Tens of millions would be my estimate. These were two of the thousands of planets in the Old Republic. But then later on one of the expanded universe writers decided that the average planet had a couple billion people even though we never see such an average planet at any point in any movie.
A population of that size makes little sense in the lore. The size of the attack force that Naboo was able to muster was about the size of the attack forces that the rebels mustered at Yavin and Hoth. So a scale that assumes that Naboo is a minow among whales is wildly inappropriate for assessing military industrial power. If the scale that each planet is billions were true that would mean that the Galactic empire would need to be so inefficient as to make North Korea look like an economic juggernaut.
The galactic empire probably only has tens of thousands of star destroyers. The battle of Yavin makes this seem like a generous estimate. The USS Voyager is NCC-74656. And the Federation added at least 10,000 starships in just a few years before Voyager was built because they were facing their first real threat in decades.
Star wars shields don't operate on frequencies however, actually being a 'barrier' which effectively diffuses incoming energy weapons, there's not much chance of actually slipping through it with a phasor. And the average hull integrity of a star destroyer I would say is actually pretty sturdy. Not unbeatable, but it will take more than a single torpedo. Those things do dwarf most ships in the federation fleet.
Literally the entire point of a phasor is to pierce unmodulated shields. It's a phased laser. They try to hit so many different frequencies that the enemy shield doesn't protect them all. But in Star Wars there aren't phased shields. So the phasor would pass straight through the shields with it's complete power.
A structural integrity field in star trek parlance refers to technology they have to use an energy field to reinforce materials. This allows star ships to shrug off attacks that would tear through the hardest materials.
Star trek teleporters would have no trouble at all going onto a star wars ship. They regularly teleport people off of spaceships at great distance in short order. The things that stop teleporters in star wars are shields (which you have to modulate through but Star Wars doesn't have shield modulators) and huge amounts of matter (or structural integrity fields).
A single photon torpedo would be plenty to take out a star destroyer. They dont have shields that can stop them. They dont have structural integrity fields to mitigate the damage. They would be depending on alloys to stop antimatter.